Rheostat.



W. C. YATES.

RHEOSTAT. v APPLICATION FILED JULY 18,1907.

Patented May 17, 1910.

Witness s;

QM (/Vk/ UNITED STATES PATENT OFFICE.

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RHEOSTAT.

. M745, Specification cfLetters'Patent. Pa'tentgd) Maty 1'?, 1910',

' i .pplieetiou July 18, 1907. Serial No. 384,422

Towivieei w energize the nto-voltage magnet and stop'the Be it kn. that C. firms, a motor et any time. I- a-leo provioemcafns in.

citiyen tile United' ,o residing at connection with.. the s eed contrelofthe mo Schenectady, county of fcc nectady., State tor .whereby the mec einem. may be locired 0% blew i1-verle,A have invented certain new against movement and the key ren'ioved so 60 and` useful Improvements in Rheostats, of that the limits of speed et which the motor W-lxiidi thefollowing: isz-fi specification. is run are not under immediate control of This invention relates to devices for con- -the operator. trolling electric circuits-'end has for its ob- In. the accompanying drawing in which ,L

101 ject the provision of means whereby an clechave Show-n my invention embodied inn G5 tric motor ma be stopped, started and genconcrete forni, Figure l isla plan view or the emily control ed in., a 1zeliable,.sae and efdevice showing the circuit connections; and cieng; manuel- 1 u Fig. 2 is a detailed vlevv of the locking mech- My invention relates more particularly to lIllSm w c i l5 means for controlling motors of the type Rererring. to the drevv1ngt, l0 is n support 70 adapted to-be run at e low speed in addition lng. base preferably oie. some insulating matetothe normal running-speed, and which it is rial, such es s'lateor soupstoned upon which desired shall be started and stopped quickly are mounted- 1n the arc of a circle startin when running at full. speed. This type of gm815 1l' fOIlllDg @he *SCXTIDJFIIS Of Sfmtcontrol: is commonly used in connection with mg nreslstlnce l2 andthe reversing segments 'in printing-presses in which it is desirable that Slllll'ly MF-RU ed. The leslSLlCe veli- Ineens be rovided whereby the motor may 111g; M111 PWOG .ai i515 `SPUQIY)GSSed to be -joggo along at a low speed. Thisjogthe position `shown in the drawing by means ging is preferably and usually accomplished 0f ill@ ClOllbl ltdlmtd Spring 1G- 2Ey by having switches arranged at definite Segments l?, i8 andlll are arranged Se points apoundthg press, my Patent No. SllOWIl l0? PUEPSSGS llelltf (lSCI'll)d,- 857,142 I have disclosed a controlling device and brushes 2 0 and 2l on one end of the arm oi*I this type in Which` the motor may be end insulatedtherefrom and brushes 22end jogged along from. points around the press 23 similarly mounted on the-opposite endof with the starting arm in theofl1 position. I the .anni engage thesersegments. Brushes 85 have found, however, .that the operator fre- 20 and 2 1v ere electrically connected together quently will not take the .trouble oit going to as .likewise are brushes 2 2 and 23, the letter one of the control switches or buttons in orbeing also connected with a brush 24 arderto jogl the motor along but will use the ranged 'to engage a. contact 25 When-the arm aocontrollng. handle.' The result is that the is moved toward running:\p0sit01i- When 9o starting contact segments are frequently inthe controlling. arm lil is in the normal or jured by arcng.. oil position, shown in the drawing, the

In carrying out my invention I provide in brushes 20, 2l, 22 and 23 are in engagement connection with a controlling device ot'- the with the conducting portions of the seg-`v 40 type above described, an electromagnetic ments. Brushes 20,21 and23, when moved 95- Vswitch which. is so arranged that the motor in either directioinpass on to insulatingporcircuit is broken upon its contacts. This tions 26, 27 and 28, respectively, before switch is energized as the controlling arm is again passing on to the conducting. portions.l moved. toward running .positionbefore the An electromagnetic switch comprisinga.

starting resistancev is substantially varied. solenoid 29 operating. bridging contacts 30 100 This switch is in parallel With the controland-31 is located at any desired point. @on ling arm so that it 4closes the armature cirtact 30 controls the mein armature circuit y cuit just before the resistance controlling. and the circuits ere so arrangedthat it; is inarmV closes it. Upon its return therefore it parallel With the resistance controlliai Will again be in parallel and Will open the switcher arm. The contact 3l controlslthe '105` circuit last. This electromagnetic switch circuit' of retainingmugnct 32 so that when likewise controls the circuit of the no-voltage the solenoid: 29 is energizedr the. circuit of retainingmagnet. und is controlled by push the retainingmagnet isop/cned* andthe mobuttons so that the latter in addition to jogtor circuit closed. A pluralityofnomnallyj ging the press along will operate to deopen switches or. pushbuttons; 33. control the 110 D, es

circuit oit the solenoid 29, which solenoid is likewise controlled through the brush 2% and Contact lhe speed-controlling resist-- ance 3d, which. is preferably in the shunt eld circuit, is varied by means ot' a contact arm 35. ln order to loclr this arm in any desired position, l provide a toothed segment 36 which is engaged by a pawl or latch pivoted at lhis latch is locked in place by means of a springpressed detent 39 engaginga slot in the latch, and a lrey Ll is arranged to move the detent and release the latch so that the resistance arm may' be turned to vary the speed as desired.

rlhe arrangement or" circuits and the mode of operation are as follows: ith the parts in the position shown in the drawing, the motor can be jogged along by closing any one of the switches 'l is will energize solenoid 29 which lifts contact 30 and the motor circuit will be closed through resistance l2 as follows: from the positive main through series lield SF, conductor ll, resistance l2, contact 30 to conducting segment 17 thence through conductor 42, armature A., to brush 23 across to segment 18 and bach to the negative main. At the same time the resistance R is connected in shunt to the motor armature to cause a quick stopping and slow running of the armature. .By opening and closing the switches 33 the rmotor may be stopped and started through starting resistance l2 and will thus run at ay slow speed. W hen it is desired to bring the motor up to normal running speed, the arm lll is moved to the right. fis soon as the brush 2l engages segment 17, brush 2a will engage contact 25, and the solenoid will be energized as follows: from the positive main, solenoid 29, conductor 43, brush 2e, segment 18 baclr to the negative main. rlhis will attract bridging contact 30 so that the main armature circuit will be closed in the same manner as if one of the switches 33 had been pressed, all of the resistance l2 being in circuit. By moving the arm farther, the brush 20 engages the lirst of segments ll and the two brushes 2O and 21 will thus be in parallel with the contact 30. The brush 2-, however, passes ont of contact 25 imrnediet-ely and denero'izes solenoid 29, allow ing the contact to drop, The armature circuit is now closed from the contact segments ll across to the contact segment l? through the connection on the controlling arm instead of across the bridging contact 30. By continuing the movement the arm is brought to running position in engagement with the magnet 32, and the motor reaches normal running speed. To stop the motor quickly, one of the switches 33 may be closed to open the circuit of retaining magnet 32. The controlling will thereupon re LL toy the oft position. By then the lswitch 33, thc circ-nit will des? be broken on the contact 30. llt, however, the switch should be opened immediately after the retaining magnet is dei'iergized and before the controlling arm reaches the otl position, the solenoid 2S) Awill again be energized just before the arm reaches the off position by the engagement of the brush 2l with the contact 25. This will pullup bridging contact 30 and again let it drop so as to open the circuit on this contact. lt is not, however, essential that the circuit opens on the contact 30 when the motor is stopped l'rom full running speed or upon -failure of voltage. The particular function of this bridging contact is to make and break the circuit when the motor is jogged along by means of a controlling arm. rl'lie running speed of the motor may be varied by unlocking the latch 3T and shifting the controlling arm so as to var f the lield resistance. the key will be in the hands ot the foreman or superintendent and the operator must therefore always run the motor at the speed at which it has been set.

lt will besee'n that l have provided a very simple and efficient means for operating motors at diferent speeds and atthe same time protecting the contacts from being burned because of the careless handling ot' the operator. The motor may also be stopped from remote points irrespective of the position ot the controlling arm and it may be started from remote points when the controlling arm is in the oit' position so as to run the motor at a low speed. I

lt will be understood, of course, that various modifications of my invention will suggest themselves to those skilled in the art without departing from the spirit oit my invention, the scope of which is set forth in the annexed claims.

YWhat l clai-m as new and desire to secure by Letters Patent of the United States, is,-

l. A starting rheostat comprising a re'- sistance varying switch, an electromagnetic switch in parallel therewith, and means whereby said latter switch is closed when the resistance switch is moved toward running position.

2. A starting rheostat comprising an electromagnetic circuit closing switch, a resist ance if'arying switch arranged to vary the resistance independently olf the electromagnetic switch, and meanswhereby the electromagnetic switch may be closed and opened by a continuous movement of the resistance varying switch without substantially varying the resistance.

La starting rheostat comprising a resistance varying switch, an electromagnetic 4. A starting rheostat comprising a re sistance varying switch, an electromagnetic switch in parallel therewith, and means whereby said latter switch is closed by the initial movementof the resistance switch Without substantially varying the resistance and opened by the further movement of said switch.

5. A starting rheostat comprising a resistance varying switch'biased to the starting position, a no-voltage magnet for retaining the same in' running position, an electromagnetic switch in parallel circuit with said resistance switch and controlling the circuit of the rio-voltage magnet, and connections whereby the movement of the resistance switch vcontrols the electromagnetic switch.

6. A starting rheostatv comprising a re sistance varying switch biased to the starting position, a `no-voltage magnet for retaining the same in running osition, an electromagnetic switch in circuit with said resistance switch, and means whereby said magnetic switch is closed and the no-voltage magnet denergized by the movement of the resistanceswitch toward running position.

7. A starting rheostat comprising a resist-ance varying switch biased to the starting position, a 11o-voltage magnet for retaining the same in running position, an electromagnetic switch in parallel circuitwith said resistance switch, and means whereby said magnetic switch is closed and the no-voltage magnet denergized by the movement of the resistance switch toward running position.

8. A starting rheostat comprising a resistance varying switch, an electromagnetic switch in parallel circuit therewith, means whereby said latter switch is closed when the resistance switch is moved toward running position, and means independent of the resistance switch for controlling the electro- 9. A. starting rheostat comprising a resistance varying switch biased to the starting position, a 11o-voltage magnet for retaining the same in running osition, an electromagnetic switch in circuit with said resistance switch, means whereby said magnetic switch is closed and the no-voltage magnet denergized by the movement ot the resistance switch toward running position, and means independent of the resistance switch for controlling' the magnetic switch. i 10. A starting rheostat comprising a re sistance varying switch biased to thestarting net position, a 11o-voltage magnet for retaining the same in running position, an electromagnetic switch in parallel circuit with said resistance switch controlling'the circuit of the rio-voltage magnet, connections whereby t-he movement of the resistance switch controls the electromagnetic switch, and means independent of the resistance switch for controlling the electromagnetic switch.

- 11. A, starting rhcostat comprising a resistance varying switch biased to the starting position, a 11o-voltage magnet for retaining the same in running position, an electromagnetic switch in parallel circuit with said resistance switch controlling the circuit of the lio-voltage, magnet, connections whereby the movement of the resistance `switch controls the electromagnetic switch,

and a normally-open switch for controlling the electromagnetic switch independently of the resistance switch.

12. The combination with a motor, of a starting rheostat therefor, an electromagnetic switch arranged to cont-rol the motor through the starting resistance with the starting arm in the otl' position, and connections whereby said switch is actuated to close the motor circuit when the arm is moved toward running position.

13. The combination with a motor, of a starting rheostat therefor, an electromagnetic switch arranged to control the motor through the starting resistance independently of the starting arm, a. 11o-voltage magcontrolled by said electromagnetic switch, and connections whereby said switch may be opened and closed by a movement of the starting arm which does not substantially vary the resistance.

14. The combination with a motor, of a start-ing switch therefor, an electromag-` closed by moving the starting arm without substantially varying the resistance, and a switch for cont-rolling the electromagnetic switch independently of the resistance switch.

In witness whereof, I have hereunto set my hand this 17th day of July, 1907.

WILLIAM C. YATES.

Witnesses BENJAMrN B. HULL, HELEN ORFORD. 

